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2019-04Holiday Arrangements for Youlianxin Qingming FestivalRespected Youlianxin customers: Youlianxin will be on vacation for three days during Qingming Festival (April 5-April 7). At that time, it will not be able to provide consultation, quotation, order, p -
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2019-03PCB孔无铜不良品质问题解析(友联鑫)孔无铜属于pcb功能性问题，随着科技的发展PCB精度（纵横比）要求亦越来越来高，它不但给PCB厂带来的麻烦（成本与品质的矛盾），而且给下游客户埋下了严重的品质隐患！下面就此做简单分析，友联鑫线路板厂希望能对相关同仁有所启示和帮助！ 一、鱼骨图分析 二、孔无铜的分类及特征 1. PTH孔无铜：表铜板电层均匀正常，孔内板电层从孔口至断口处分布都